Removes hard dependency on donjayamanne.githistory

Provides optional additional code lens

package.json

@@ -41,9 +41,6 @@
         "typescript": "^1.8.10",
         "vscode": "^0.11.17"
     },
-    "extensionDependencies": [
-        "donjayamanne.githistory"
-    ],
     "scripts": {
         "vscode:prepublish": "node ./node_modules/vscode/bin/compile",
         "compile": "node ./node_modules/vscode/bin/compile -watch -p ./",

src/constants.ts

@@ -1,7 +1,8 @@
 'use strict'
 
-export type WorkspaceState = 'repoPath';
+export type WorkspaceState = 'hasGitHistoryExtension' | 'repoPath';
 export const WorkspaceState = {
+    HasGitHistoryExtension: 'hasGitHistoryExtension' as WorkspaceState,
     RepoPath: 'repoPath' as WorkspaceState
 }
 

src/extension.ts

@@ -1,5 +1,5 @@
 'use strict';
-import {CodeLens, DocumentSelector, ExtensionContext, languages, workspace} from 'vscode';
+import {CodeLens, DocumentSelector, ExtensionContext, extensions, languages, workspace} from 'vscode';
 import GitCodeLensProvider from './gitCodeLensProvider';
 import GitBlameCodeLensProvider from './gitBlameCodeLensProvider';
 import GitBlameContentProvider from './gitBlameContentProvider';
@@ -23,6 +23,7 @@ export function activate(context: ExtensionContext) {
 
     git.getRepoPath(workspace.rootPath).then(repoPath => {
         context.workspaceState.update(WorkspaceState.RepoPath, repoPath);
+        context.workspaceState.update(WorkspaceState.HasGitHistoryExtension, extensions.getExtension('donjayamanne.githistory') !== undefined);
 
         context.subscriptions.push(workspace.registerTextDocumentContentProvider(GitBlameContentProvider.scheme, new GitBlameContentProvider(context, git)));
         context.subscriptions.push(languages.registerCodeLensProvider(GitCodeLensProvider.selector, new GitCodeLensProvider(context, git)));

src/gitCodeLensProvider.ts

@@ -23,7 +23,11 @@ export class GitHistoryCodeLens extends CodeLens {
 export default class GitCodeLensProvider implements CodeLensProvider {
     static selector: DocumentSelector = { scheme: DocumentSchemes.File };
 
-    constructor(context: ExtensionContext, private git: GitProvider) { }
+    private hasGitHistoryExtension: boolean;
+
+    constructor(context: ExtensionContext, private git: GitProvider) {
+        this.hasGitHistoryExtension = context.workspaceState.get(WorkspaceState.HasGitHistoryExtension, false);
+    }
 
     provideCodeLenses(document: TextDocument, token: CancellationToken): CodeLens[] | Thenable<CodeLens[]> {
         const fileName = document.fileName;
@@ -38,7 +42,9 @@ export default class GitCodeLensProvider implements CodeLensProvider {
             if (!lenses.find(l => l.range.start.line === 0 && l.range.end.line === 0)) {
                 const blameRange = document.validateRange(new Range(0, 1000000, 1000000, 1000000));
                 lenses.push(new GitCodeLens(this.git, fileName, blameRange, new Range(0, 0, 0, blameRange.start.character)));
-                lenses.push(new GitHistoryCodeLens(this.git.repoPath, fileName, new Range(0, 1, 0, blameRange.start.character)));
+                if (this.hasGitHistoryExtension) {
+                    lenses.push(new GitHistoryCodeLens(this.git.repoPath, fileName, new Range(0, 1, 0, blameRange.start.character)));
+                }
             }
             return lenses;
         });
@@ -71,7 +77,9 @@ export default class GitCodeLensProvider implements CodeLensProvider {
         }
 
         lenses.push(new GitCodeLens(this.git, fileName, symbol.location.range, line.range.with(new Position(line.range.start.line, startChar))));
-        lenses.push(new GitHistoryCodeLens(this.git.repoPath, fileName, line.range.with(new Position(line.range.start.line, startChar + 1))));
+        if (this.hasGitHistoryExtension) {
+            lenses.push(new GitHistoryCodeLens(this.git.repoPath, fileName, line.range.with(new Position(line.range.start.line, startChar + 1))));
+        }
     }
 
     resolveCodeLens(lens: CodeLens, token: CancellationToken): Thenable<CodeLens> {